Xiaogang and his classmates play a card game. First, they divide the cards into three piles: left, middle and right. The number of cards in each pile is equal to or more than two. Then they go through the following steps Take a card from the left pile and put it in the middle pile, Take three cards from the middle pile and put them in the right pile As many cards as there are in the middle pile, take from the left pile and put them into the middle pile of tribes. At this time, what is the number of cards in the left pile?

Xiaogang and his classmates play a card game. First, they divide the cards into three piles: left, middle and right. The number of cards in each pile is equal to or more than two. Then they go through the following steps Take a card from the left pile and put it in the middle pile, Take three cards from the middle pile and put them in the right pile As many cards as there are in the middle pile, take from the left pile and put them into the middle pile of tribes. At this time, what is the number of cards in the left pile?

Let each of the left, middle and right have X + 2 (x > 0) cards. Take one card from the left pile and put it in the middle pile. Take three cards from the middle pile and put them in the right pile. Take three cards from the left pile and put them in the middle pile